Is my best friend in the closet?

Ok so this is something that I have been thinking for a few years. I'm wondering if my best friend is bi and I want to talk to him but I want to get some other opinions first. I'm not gonna say everything that makes me think this because I will literally be here for 5 years writing, but I'm gonna bring up a few valid reasons. We can start with how he acts, especially around me.

He gets very touchy when he's near me, and one time when we were sitting in class he was poking me. He started at my shoulder and I was trying to get work done and I told him to stop. He did stop then he started again and poked me. I ignored him so he kept at it and then he started poking me lower until he was at my thigh when I looked at him. He stopped and just kinda giggled and started talking to me about something else, but he seemed kinda off. Also, there he often jokes around and says something like "you know what, you should go suck my dick" but then he almost immediately gets kinda nervous it seems and says "actually don't do that because that would be gay". How he says it tho is what tips me off, he says it as tho he's trying to force me to believe something, then quickly changes the subject. Also he commonly denies saying things like that but I tell him "listen I remember you saying it" then he stops fighting me and changes the subject. A few of our friends have brought this up several times as well. He has told me on several occasions that he trusts me more than anyone and has told me some weird shit.

Also when ever I'm alone with him I can feel something different about him, almost like he's trying to make a connection but he won't actually do it. I can go on all day about this so if you want to know more I can add more. The last thing that kinda set me off is something I told him. A few months ago I told him in was bi and he was fine with it, and I have noticed we have gotten a lot closer than before, however in have noticed that he has changed his demeanor around me and he acts almost like we're dating most of the time, usually when we are alone together which is almost every day. I can see that he's hiding something, I feel that he is most likely bi but just hasn't come to terms with it yet. The reason I came out to him is partially because I needed someone I could trust to tell, and I felt that if he knew then he might be more comfortable if he is indeed closeted somehow. A few of my close friends has said that he does act different around me, and he talks about me a lot. For example, about a year and a half ago, when he started doing really odd things, I was dating this girl, and he was obsessed with us and a few people said he even seemed a little bitter when someone would mention us, or if he was talking about us.

I know I could be overthinking this, but if anybody else was in my shoes you would agreed 100 percent. He also said that I can ask him a few questions about anything, and he had to answer honestly, I haven't asked any yet but I feel that maybe he was trying to get me to ask him about this. He also does not like it when I say something is gay as a derogatory statement, even tho I'm joking, and he is not one to be easily offended. Also he always talks about hot girls and has had a few chances to get with them, but never tried to and claims he's too lazy. Sorry if this is long, but I just want some opinions. I could literally write a 1000 page book about things that draw me to this conclusion. I'm gonna ask him at some point but I was some advice first. Thanks.